<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/bmi">
    <input type="text" name="height" placeholder="请输入身高（单位m）">
    <input type="text" name="weight" placeholder="请输入体重（单位kg）">
    <input type="submit">
</form>

</body>
</html>